Boat Overheating At High Rpms

Outrunners do run cooler but most of them rely on airflow for cooling. if you're seeing high pressure due to load at lower rpms, your engine is a candidate for oil burning. (Alternator output drops at all rpms as the alternator gets hotter. It is in your best interest to avoid that at all costs! It is important to understand how the water pump works in the engine’s cooling system so you can be better aware of why your car’s water pump may be failing. Is your bottom and running gear clean of barnacles and growth? Do your engine's reach the manufacturers stated top RPM? If the vessel is running too much propellor it will cause a high load/high exhaust heat situation. ] you will find them to have extreme pitch, [or advance] and be of small diameter. All new components, including the inline high-pressure fuel pump, fuel cooler, vapor separator, fuel injectors, and a new throttle body, were designed as compact and lightweight as possible. There can be quite a few causes, depending on what you mean by "high rpm". but now it bogs out at 3000 rpm and. 3 engine is overheating at high rpms. For example, I will start the boat, could be the 1st or 5th start of the day- it does not matter if boat is cold or warm. Nominal being according to them 5500 rpm. I have owned this boat since 2005. With both removed, you can see that the water pressure is less on the starboard side. Because it plays a crucial role in keeping the engine at a satisfactory temperature, allowing the engine to function, a damaged or otherwise failing thermostat can cause overheating. Did you run it at max RPM's for a few minutes and measure it again? Perhaps it is just a bad sender. Ever wonder why your boat is overheating? Just take a few minutes and listen Justin from SkipperBud's of Madison, WI. My boat dies (not under a load) in neutral when I adjust my curb idle screw below 1000 rpm's. My owners manual says I can run this motor full at 5400 rpm max. Idles well, although a couple of hundred degrees low. Not revving the engine high once in a while is BAD. While there seems to be an abundant number of folks selling high performance carburetors and carb kits, there seems to be a desperate shortage of folks providing "understandable" carburetor tuning information. Overheating alarm does not go off. In the hot June weather the boat ran 70. Rxt only overheats only when you go above like 7000 rpms. A few possible causes could be broken or incorrect size propeller. Last thing is the riser and i would say maybe it is the problem, combined with a bad impeller. It’s located under the High pressure fuel pump; it’s made out of aluminum and will corrode. The Honda BF60 is a 4-stroke 60 hp marine engine. If the boat sat, likely scenario is the impeller. Then she began reving high with a lack of propulsion when 4 people were on the boat or if pulling a wakeboarder. Engine overheating. Also, at least with my 454's, if I idle for a longer period of time, the temps rise, if i give enough throttle to get the RPM's at about 1000, the temps drop, due to increased water flow through the HE's. Remove the ports and visually inspect them for deposits that would restrict the water flow. CRA E EE Installation Process At-a-Glance 1. A bad water pump or thermostat will reduce water flow as well. Aluminum propellers can be changed two (2") inches up or down in pitch. Hey guys had the boat out today for the first time on the water this year. If the motor is trimmed out too far, the bow will ride too high in the water. I took it back to the dealer who did the previous repairs (impeller, housing, poppet valve). Making amends now. The following image is an example page of what a typical digital download MerCruiser repair manual is. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around. BluePrintEngines. Velvet Drive Transmissions is a leading manufacturer of marine and industrial transmissions. A little steam is normal. 7 liter block and powerhead used in the 200-hp Verado. Boat specs state @ 2400 rpm's boat should run 24knots. No damage done!!. The water pump is working because it streams water ok. He told me that his motor temp gauge looks good at idle, but as he increases the speed or RPM's, his temp gauge goes up. Anyway, several times, I've taken the boat out to the bay, and across to Fire Island (4 mile trip). I didn't bother increasing throttle to he point tat the temp rose to hot, it thing the cause of the high RPM overheat has been discovered - now on to finding and repairing the root cause!. At 1900 rpm's engines run at about 190 degrees F. Sounds like you have partially blocked cooling passages or a bad impeller. Advanced, exact-fit and precision-ground belt profile. Sounds crazy, but for your vintage boat, it's the number one root cause of many issues including a low idle overheat indicator. The first time I had a bad spark plug which had a crack ceramic insulator. Check out Honda's full line of dependable 4-stroke outboard motors, from mid-range, and high power motors, from 25 to 250 hp at Pinnacle Marine Service, LLC in Salt Lake City, UT. can't find cause for temp alarms going off 150 HP Yamaha's. We were out fishing and couldn't run at high rpms without the alarm sounding. Discussion in 'Boating Discussion' started by aed, Jan 19, 2009. Rxt only overheats only when you go above like 7000 rpms. Does anyone know what the water pressure should run on this engine. To complement the Shinex, Festool offers an assortment of polishing compounds, pads and sponges to repair and perfect paint flaws. 3 engine is overheating at high rpms. 1999 mercruiser 4. He left the ramp and the outboard had idoled for 2 minutes and had run in gear at 5 knots for one minute then 3500 rpm for 30 seconds when a warning beeper sounded so He shut the motor off. 7 Year Warranty on this product. So I hired a diesel shop to. If equiped with say a power steering cooler then i would be looking to that next. Re: Volvo penta 2001 overheating alarm They are direct raw water cooled, the waterways in the heads are prone to salting/silting up, if you take the anode out( its on the front of the head) and have a look inside and have a poke around with a bit of wire it might become a bit clearer as to whats happening. 4 mercruiser what could be causing a merc 6. If I keep the throttle backed off a little from full it will run fine but I would like to get as much speed as I can out of her. I notice it tends to move from the first tick to the right of the halfway mark, to the halfway mark. A bad water pump or thermostat will reduce water flow as well. Review your Installation Guide carefully before beginning installation. Rxt only overheats only when you go above like 7000 rpms. Whether you are putting your equipment away for the season or needing to replace a part, locate your equipment or engine manual to get the information specific to your product. on account of displacement limits in the racing. I chose a 22' Sea Sprite made at a company near Chicago, powered by a Mercruiser 5. High pressure side reads 20 psi at idle and 50 at 2000 rpms. Finally solved the overheating in the 5. The mechanics open the pump and reuse the O-ring so this is a just in case change. Thanks, Phil. XDP-B drives should read between 1-5hg (vacuum) at the inlet and between 2-12 psi at the outlet. Not necessarily you generally have to treat each engine independently in my opinion. At dead low idle (500-600 RPM), in gear and moving, the starboard overheat sensor causes the alarm horn to sound after 3 to 5 minutes running. 6-liter supercharged Verado powerhead that was introduced in 2004, with fresh tuning and. They think the boat is two big for the engine and that is why the rpms are running 1200 rpm under nominal. If it is stuck closed at idel everything works as normal and then will overheat at high rpm's. 2'mpi to overheat only at high rpms what could cause overheating in a 4. Just thought I'd pipe in there for you. Mercruiser 350 mag engine overheating - Answered by a verified Marine Mechanic We use cookies to give you the best possible experience on our website. so, at 3000rpm, 40psi is sufficient. - Answered by a verified Marine Mechanic. I have changed the propeller pitch, replaced the raw water pump and fresh water pump, cleaned out the heat exchangers, and replaced most of the hoses. 04' Mercury Optimax 90 beeping after 4000 RPM. My 1987 150 yammy will run fine up to about 4300 rpm. 701 SuperJet Limited. When I started my car this morning it was -15F and my car was idling at 2,100 rpm then ~10 minutes later when it was warmed up it idled at just under 1,000 rpm. My jump into the four stroke outboard world was with Mercury Verado. When this system fails due to a leak or an engine mechanical or cooling system failure it will enable the engine to overheat which will produce internal damage and cause the engine to stop running. This motor has a two stage trim, where the slow trim on the low end and it won’t let you go too high over a certain RPM. had the boat. 8 mph and got 3. In the BOINC manager "Advanced" / "Preferences" / "processor usage" / "Use at most xx % CPU time" you can setup the CPU throtteling. I can not figure this because my original prop I now find is a 23 pitch. When you are moving at high speed on the highway the airflow through the radiator is enough to cool the engine. Every time the boat was started you could see rust in come out of the exhaust so I figured it wasn't a bad idea. Engine hours 110. Hopefully some Merc guru here will know those numbers. Yours may be different however. Never again worry about your tool overheating due to a built in thermal protection feature. Overheating was experienced at low rpm but rev up above idle and it was ok. I strongly recommend you to use the CPU throtteling. Tohatsu, Japan's oldest outboard manufacturer, has been producing high quality, durable outboard motors since 1956. The boat is a 1981 35 CHB tri tachs read 2500 RPM at this speed (but may read high) * 120 Lehman overheating. RPM can also refer to the revolutions per minute a computer case fan or heat sink fan spins. With two new QC4v engines introduced, it's been a big opening morning at the Miami International Boat Show for Mercury Racing. Crafted for ~60’ - 69’ boats, up to ~50 tons, the Seakeeper 16 is designed to eliminate up to 95% of boat roll. I also have an E-Tec 225 that had some overheating problems. It's not a constant beep, so it's not overheating. These gallon per hour figures are at roughly 3500 RPM. The motor fires up just fine. I don't get anything near max rpm from my Westerbeke 55. Normal op temp i believe is 150-160. For literally decades, Racing Beat has recommended NGK Spark Plugs for Street, High Performance, and Race rotary engine applications. My 1995 Mercury 135HP 2 StrokeOutboard has decided to overheat whenever the RPMS are around 1200-2000. 5 L Model 400 4200-4600 2. Then the check engine light came on. The four valve head actually demonstrated a better valve control than the two valve B at high rpm, probably due to the lower inertia of the valves. Upon restart the engine temperature was still high enough and remained high enough on your 1 minute return to the dock to trigger the alarm. The engine gets flushed with Salt remover every other. The Honda BF115 is a 4-stroke 115 hp marine engine. The engine has never overheated. then possible blockages of some sort. 1 Crusader 2008 overheating at high RPM only. At dead low idle (500-600 RPM), in gear and moving, the starboard overheat sensor causes the alarm horn to sound after 3 to 5 minutes running. 3 MerCruiser engine rpm is below manufacture specifications at wide-open-throttle WOT (or engine laboring). The overheating was a manifestation of a manufacturing defect. Speed - Electric - High KV in a boat? - I have been on 2 and 4 wheels since the 80's but would consider myself a noob with brushless boats. 3 mph at 6,700 rpm. 150 Speed Ster ® ALL-NeW Front storage bin Ski pylon – pull-up Folding tower (optional) ALL-NeW Sunpad ALL-NeW Stereo system with Mp3 port ALL-NeW Full instrumentation dash MUSCLeCrAFt – 2012 • 1. An Evinrude outboard motor that keeps overheating can be fixed with relative ease. pull it off wherever it goes to hold it straight up with the drive submerged start the boat. 701 SuperJet Limited. The electric fan will only kick in at low speeds or stopped for any lenght of time. 75 OLt Main (ECU) relay and system relay malfunction, wiring isopen or relay is stuck - 76 OLH Engine oil overheat 78. Make sure the boat's bottom or the prop are not fouled, excess drag can cause "overfueling" which results in unburned fuel and usually black smoke (which you do not report). How to Stop an Engine from Overheating. Full Throttle @ WOT,,,LOWER TILT 35 knots. Subject: Re: Overheating only at higher rpms A crack between cyl 3&4 is the common thing on the 1KZ which only opens up at high load. It was used in saltwater before I purchased but was stored in a high and dry and flushed after each use. Has anyone encountered this in the past?. Comparing say 2200 RPM to the fuel burn curve, it*shows about 70 - 75% of the rated fuel burn for that engine. The temp gauge slowly creaps up to above operating temp (usually 160 at idle). Put the boat in the water and idled around for a few minutes while motoring out of the harbor. No, this is not plagiarism! If you have read a slightly less polished compilation on the Internet here, don't write me a nasty e-mail saying that I stole this please!. It acts normal at low speedsgo to high speed and it will give high temperature alarm. After the first time it refused to run over 3000 rpm I added 8 ounces of Sea Foam, 3 ounces of Startron by Staybrite, and have replaced both fuel filters. Did you run it at max RPM's for a few minutes and measure it again? Perhaps it is just a bad sender. 174 Fuel System Fuel Pressure is low. Yes, you can use car motors. 3 overheating at higher RPMs. Engine RPM Chart is for reference only. Otherwise the water just recirculated and got hotter and hotter. I just got this Jeep in January, so I'm watching like a hawk. Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. Alarm happens both at idle and atspeed. 2 blade propellers are useful because they. Our stock SuperJet went 44. Showcasing 18ft 3100 12 available for buying now on the internet!. Engines start ok, plenty of blue smoke. Well I ran to the boat and notices that the hose connected to the tank was corroded, as I was taking it off it fell off in my hand. They could be normal, high, low, and this will pin point the place to look: Normal maximum RPM = hull problem. I've had the boat 2 years and regrettably neglected it for the 1st year. With over 60 years of marine engine innovation and design experience. They are sending me free of charge a 6 pitch prop to test and see what that does. Finally solved the overheating in the 5. - Answered by a verified Marine Mechanic. In appearance, it looks as if the trailing edge was bent upwards into a small radius. Or the hose is kinked right at the fitting that enters the transom inside. High torque capacity and high speed are available from this naturally balanced coupling Clamp or Set Screw Clamp or Set Screw Set Screw Clamp or Set Screw Set Screw, Bonding, or Cross-Pinning Up to 3000 rpm. Engine overheating at high rpm. 1 Crusader 2008 overheating at high RPM only PDA View Full Version : 8. Re: Overheating at High RPM Here is a pic of the most affected side - after cleaning. Yesterday it began to run rough and lose RPMs while overheating at the same time. If i ain't mistaken, you'll be wanting to see oil pressure at least 40psi at idle, and then rpm/1k+10 underway. Knowing all of your temp sensors are working correctly as well as your overheat alarm is great piece of mind. “High performance” modules have a higher amperage cut-off point to “optimize high RPM performance”. BBMS Swanwick has high quality inboard/outboard motors for sale in Southampton. Engines pretty smooth but overheat above 2000 rpm, and black smoke as turbos kick in, then clears. 75 Amps 10 gauge High Output Alternator Wiring Kit 555 -10510 100 Amps 8 gauge 150 Amps 6 gauge 200 Amps 4 gauge It is very important to use the correct wire size to connect the alternator to the battery. In fact, more than half of the company's total engine production between 1919 and 1934 was built for marine applications. Lightweight Rounded Design - Easy to transport, BF9. High performance boats have a high power-to-weight ratio. Knowing all of your temp sensors are working correctly as well as your overheat alarm is great piece of mind. I’ve run the boat at this RPM for years without issue. Replaced manifolds and risers 2 yrs ago. August 4th 2019 at around noon took our boat out for a long trip on Georgain Bay. Up to 3000 rpm. 1 Crusader 2008 overheating at high RPM only. Just put it in the water today. This weekend started running hot at idle speeds or in slow forward but on plane or faster temps would drop to middle of range right away. I was recently informed that if the water impeller on these drives was not installed in a specific way with a sealent they can slip at high rpms and allow exhaust from the hub I to the impeller and cause a high speed overheat. No I don't mean harder plugs, competition coils, lumenition etc. Part of the process involves running the vessel at full, or wide-open, throttle—what engine manufacturers often refer to as WOT. Specially-engineered to deliver maximum boost and performance, these belts feature the most advanced technology. RPM can also refer to the revolutions per minute a computer case fan or heat sink fan spins. I strongly recommend you to use the CPU throtteling. Jun 13, 2006 and deliver fuel economy in the engine's most commonly used rpm range-2500 to 5500. I would not recommend running it at high rpms even though its not overheating as if vains break off. We have changed the impeller, impeller housing, poppet valve, thermostats, and exhaust gaskets. ( Direct ignition is used on this engine to significantly reduce this effect, but it still happens). Furthermore, at 1400 RPM, the engine is working very hard (near maximum cylinder pressure) which leads to high loads on rings, pistons, and bearings. Run it in the water not fixed then pull the riser if you don't have any heat exchanger on the boat. Advanced 3-step charge regulator for standard and high performance alternators. The water pump is brand new and no wear, (lower unit pulled last fall) new t-stats installed along with a good back flushing. Once the temperature hits 200F, I slow down to prevent damage and everything returns to normal. It was a surprise so I pass it along. I was playing around with trim while running. 0 L Model 400 4200-4600 1. 8 mph in a test of the Glastron DX 215 BR. Get to the Fish, Fast. Marine diesels should run at 180 degrees Fahrenheit. BluePrintEngines. But, I had the same problem a while back. pull it off wherever it goes to hold it straight up with the drive submerged start the boat. Motor #2 which spins CCW does not have any problem with and w/o the propeller on at high RPMs. of torque at 3,200 rpm. This weekend started running hot at idle speeds or in slow forward but on plane or faster temps would drop to middle of range right away. Making amends now. Chugging along at 1800 rpm, the boat did perhaps in the upper 7's knots, temps reached maybe 200 deg. After running at higher rpms for about 10mins it started running roughly and loosing power, I brought the throttle back and the boat ran fine at lower speed and RPMShappened twice, both times about 10min into the higher speed stretches. A wide variety of high rpm electrical motor options are available to you, such as certification. They are easy to change with the boat on the trailer. They were clean and flowing good. Without a tachometer, the operator has little opportunity to know if the engine is at a dangerously high or low rpm level. 0 L engines, and a best cruise of 25. I have a dead starter and also a popping at high rpm (backfire occasional) and noisy valves. Problems with my Johnson outboard This motor will reduce its RPMs if it is overheating. Put the boat in the water and idled around for a few minutes while motoring out of the harbor. Hello All,Ive got a 06 350 mag mpi with the 3 point seawater cooling system in my 246. The long hose that comes in from the transom raw water. 4 mercruiser what could be causing a merc 6. Hi all, I have a 45' Caribbean (Bertram) with 2 x 3208 TA's 435 hp engines - serials 01Z33399 and 01Z33400. No matter what you do, there is always a chance that products will fail. This means that a marine engine will overheat to extreme temperatures very quickly. All that said, a couple times I have had issues getting water to prime into the system. once you bring it back to under 3000 rpm motor cools back down. 354 overheating incident I headed into a 15kt breeze with minor chop. Furthermore, at 1400 RPM, the engine is working very hard (near maximum cylinder pressure) which leads to high loads on rings, pistons, and bearings. Low levels or loss of coolant, poor air flow through the radiator and a defective thermostat are just a few of the problems that could cause a diesel engine to overheat. Slow down to under 2000 rpm, the alarm will stop after a few minutes. Took it to my mechanic - he first replaced the water pump, didn't help. 3 running hot. Most people will use the boat 75-100 hours per year. I posted about this same problem 2 weeks ago. It does stay cool when using the earmuffs but not when sucking water normally. The alternator spins faster than the engine. To summarize, at idle, no bubbles, at plane speed, (sorry, tach is broken) guessing 2000-2500 RPM, the bubbles are fast and furious. Incorrect rotor location. like 7000+. Rpm, I don't recall Yamaha Specs Recommended Min-Max RPM 4500-5500 @ WOT for this 90 HP! I have a 70 hp 2 stroke Yamaha and it has Recommended Min-Max. Yesterday out on the boat, everything running great, until later that afternoon started engine to move away from shore, and the overheating alarm went off and would not go away. 3 overheating at high rpm;. Select from our wide range of Commercial Propulsion Engines, High Performance Propulsion Engines, Marine Generators, and Auxiliary Engines. It will run all day, perfectly happily at 2500-2800rpm, but if I gun along for half an hour or so at 3000rpm, it will get hotter than it used to do and eventually sound the overheat alarm (or cause the calorifier PRV to. The boat may also begin to "porpoise" or pound the water in a rhythmic pattern when the drive is trimmed too far up. Even mild overheating can cause serious damage to expensive engine components. 7 bravo 2 overheating at high rpms or under load; 2005 mercruiser 4. Consider this: a boat prop is always putting a load on the motor. high mechanical and volumetric efficiencies with smooth flow and low pulse ripple. 9 is perfect for small boats, dinghies or auxiliary. While common, these engines are also controversial. USAGE: Hobbyist use in my garage. Electric motors are not efficient, most have a rating of about 50% due to factors such as heat and friction, some may be as high as 70%. A few possible causes could be broken or incorrect size propeller. A bad water pump or thermostat will reduce water flow as well. 7 Mercruiser Overheat at High RPM June 24th, 2014, 07:43 PM This spring, I pulled the boat out for season make-ready maintenance which includes pulling the. After all, it is a device, which must be taken care of and replaced after aspecific time. Of course, you should never overlook the possibility that the water intake is plugged. what causes a 9. However, keep in mind that as you increase the RPM of a fan the noise or decibel (dBA) also increases. The engine gets flushed with Salt remover every other. This motor is on a 24' pontoon boat. If your rod bearings have worn completely out or become too loose, it is only a matter time before the bearings fail. Replaced manifolds and risers 2 yrs ago. Bquick, check the thermostats first and then the water pump impeller. OMC RPM CHART HP/Model WOT RPM Gear Ratio 1. 3 high rpm after changing belt and pulley; 2001 mercruiser 5. I’ve run the boat at this RPM for years without issue. That was in 2001. Hello All,Ive got a 06 350 mag mpi with the 3 point seawater cooling system in my 246. As the engine RPM climbs, the voltage supplied to the spark plug by the ignition coil drops off slightly. 0 mercruiser that overheats at higher speeds. 0 mercruiser high rpm wide open and over heat; 350 magnum fuel cooler engine running hot at 4500 rpm; 350 magnum mercruiser overheats only at low rpms; 350 mercruiser boat overheating. Starboard engine is overheating. 0 mercruiser that overheats at higher speeds. Example: mercruiser 4. Microscopic crack in the head that will open up at high RPMs, subsequently jettising the coolent and overheating the engine. With over 60 years of marine engine innovation and design experience. If engine sump temperatures rarely exceed 212 degrees. Most outboard maintenance schedules call for inspection of the impeller every 100 hours, or once a year. I have a Crusader 454 330 hp overheating. Cummins 6BT5. The engine has never overheated. Yesterday it began to run rough and lose RPMs while overheating at the same time. Trailing edge cup is incorporated into propeller designs to improve their efficiency when operated on higher speed boats and/or for propellers for turning at high RPM. One part might be responsible, or a number of parts can contribute to the overheating problem. 3 engine is overheating at high rpms. I note you recommend changing the thermostat as a first diagnostic action but is that even if the fan works, I do get Blue smoke but not exceessive. water pressure is at 8 - 10 at low rpms and 20 - 3o at high rpms. Anyone have a similar issue? I have a 2002 348 and one of the Volvo Penta's (5. While there seems to be an abundant number of folks selling high performance carburetors and carb kits, there seems to be a desperate shortage of folks providing "understandable" carburetor tuning information. At high end RPM's there is a temporary surge in RPM's. 3 at high rpm California since 1980 as a custom boat builder, repower specialist, designer, and supplier of equipment to builders, commercial. My boat dies (not under a load) in neutral when I adjust my curb idle screw below 1000 rpm's. thank you, sir I hate the feeling you get when something is wrong and you don't know how bad it is- and I've found that at least knowing what you're up against helps, for some reason. This can be a result of a broken or damaged propeller, replace prop if necessary. 0 litre runs hot at 4000 rpms; 2003 mercruiser 5. You may have to register before you can post: click the register link above to proceed. Unfortunately, too many of those boats are operating with unbalanced and undersized electrical systems, resulting in unnecessary problems that drain both your patience and pocketbook: dead batteries, long charging times, etc. I have had problems overheating at idle. With two new QC4v engines introduced, it's been a big opening morning at the Miami International Boat Show for Mercury Racing. What do u guys think?. Overheating had been a problem for some time prior, incidentally. Alpha Pro III. Inboards, Bravo, TRS and all the Speedmaster drives have a separate intake pump on the engine. I had the same thing happen to my 1993 Mercruiser 350. Things break. At 1,650 rated rpm it is less than half of these high revving engines and will truly last forever. MasterCraft Frequently Asked Questions (FAQs) What tips do you have for cleaning the outside and inside of my MasterCraft? Here are some ideas for keeping your MasterCraft looking like new: 1. RPM International Inc. A continuous set of beeps means the engine is overheating. Motor #4 which spins CCW seems to have an issue a high RPM with the propeller on. If equiped with say a power steering cooler then i would be looking to that next. The boat ran awesome, until we idled around a little bit. Shop Rock River Marina and Motorsports in Edgerton Wisconsin to find your next Sea-Doo GTX iS™ 215 Watercraft. Since we are turning smaller props at high rpm's, we are using inrunners for this example. Does this sound like an issue with the oil change? I do keep the boat in the water and I'm also worried about growth on the raw water intakes on the lower unit that might limit cooling ability at high RPMs. had my cummins 6BTA rebuilt sounds great when running took out for trials when doing around 1500/2000 rmp all good temp wise but soon as you give her full load temp go up to 200 far ease back off then the temp settles back down,again run at lower rpm no problems could this be thermostat problem,or maybe air lock any help please. ) creates flow, not pressure – pressure is only a signal of the resistance to flow! When troubleshooting any power steering system, it is always important to remember that there are. How to "Break-In" Your Newly Rebuilt Engine. This exceptional piece of machinery has been purpose built to meet the needs of the high performance and competition market, and is ideally suited to smaller bass boats, flats boats, skit boats, bay boats and other performance hulls. Engine overheating. There was a probe for a gauge in each of the cylinder heads, and also a probe for the third gauge installed near the water thermostat. The information on this page represents the L type unless specified. I have a 2004 150 Mercury with 600 hours that I purchased new and changed water pump every 12 months. Minibikes and 125s have even less chance of fouling plugs, because they are ridden at such high rpm. 2'mpi to overheat only at high rpms what could cause overheating in a 4.